sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent with a glassy luster, conchoidal fracture, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent with a glassy luster, conchoidal fracture, and no cleavage.
Formation & geological history
Formed through mechanical weathering and transport of larger quartz-bearing rocks in rivers or marine environments over millions of years.
Uses & applications
Used in landscaping, aggregate for construction, and lapidary work.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is extremely resistant to weathering.
Field identification & locations
Found worldwide in riverbeds, beaches, and conglomerate rocks. Easily identified by its hardness which can scratch glass.
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary